Datasheet

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TDA8945S

15 W mono Bridge Tied Load (BTL) audio ampliﬁer

Rev. 02 — 7 April 2000 Product speciﬁcation

1. General description

The TDA8945S is a single-channel audio power ampliﬁer with an output power of

15 W at an 8 Ω load and an 18 V supply. The circuit contains a Bridge Tied Load

(BTL) ampliﬁer with an all-NPN output stage and standby/mute logic. The TDA8945S

comes in a 9-lead single in-line (SIL) power package. The TDA8945S is

printed-circuit board (PCB) compatible with all other types in the TDA894x family.

One PCB footprint accommodates both the mono and the stereo products.

2. Features

■ Few external components

■ Fixed gain

■ Standby and mute mode

■ No on/off switching plops

■ Low standby current

■ High supply voltage ripple rejection

■ Outputs short-circuit protected to ground, supply and across the load

■ Thermally protected

■ Printed-circuit board compatible.

3. Applications

■ Mains fed applications (e.g. TV sound)

■ PC audio

■ Portable audio.

4. Quick reference data

Table 1: Quick reference data

Symbol Parameter Conditions Min Typ Max Unit

supply voltage 6 18 25 V

quiescent supply current V

=18V; R

= ∞ - 1828mA

stb

standby supply current - - 10 µA

Summary of content (21 pages)

PAGE 1
TDA8945S 15 W mono Bridge Tied Load (BTL) audio amplifier Rev. 02 — 7 April 2000 Product specification 1. General description The TDA8945S is a single-channel audio power amplifier with an output power of 15 W at an 8 Ω load and an 18 V supply. The circuit contains a Bridge Tied Load (BTL) amplifier with an all-NPN output stage and standby/mute logic. The TDA8945S comes in a 9-lead single in-line (SIL) power package.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier Table 1: Quick reference data…continued Symbol Parameter Conditions Min Typ Max Unit Po output power THD = 10%; RL = 8 Ω; VCC = 18 V 13 15 - W THD total harmonic distortion Po = 1 W - 0.03 0.1 % Gv voltage gain 31 32 33 dB SVRR supply voltage ripple rejection 50 65 - dB 5.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 7. Pinning information 7.1 Pinning handbook, halfpage OUT− 1 VCC 2 OUT+ 3 IN+ 4 IN− 5 SVR 6 MODE 7 GND 8 n.c. 9 TDA8945S MBK937 Fig 2. Pin configuration. 7.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 8.1 Input configuration The TDA8945S inputs can be driven symmetrical (floating) as well as asymmetrical. In the asymmetrical mode one input pin is connected via a capacitor to the signal ground which should be as close as possible to the SVR (electrolytic) capacitor ground. Note that the DC level of the input pins is half of the supply voltage VCC, so coupling capacitors for both pins are necessary.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 8.2.2 Headroom Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom – compared to the average power output – for transferring the loudest parts without distortion. At VCC = 18 V, RL = 8 Ω and Po = 10 W at THD = 0.1% (see Figure 6), the Average Listening Level (ALL) – music power – without any distortion yields: Po(ALL) = 10 W/15.85 = 631 mW.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 8.4 Supply Voltage Ripple Rejection (SVRR) The SVRR is measured with an electrolytic capacitor of 10 µF on pin SVR at a bandwidth of 10 Hz to 80 kHz. Figure 12 on page 11 illustrates the SVRR as function of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection behaviour at the lower frequencies. 8.5 Built-in protection circuits The TDA8945S contains two types of protection circuits, i.e.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 11. Static characteristics Table 7: Static characteristics VCC = 18 V; Tamb = 25 °C; RL = 8 Ω; VMODE = 0 V; Vi = 0 V; measured in test circuit Figure 13; unless otherwise specified.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 12. Dynamic characteristics Table 8: Dynamic characteristics VCC = 18 V; Tamb = 25 °C; RL = 8 Ω; f = 1 kHz; VMODE = 0 V; measured in test circuit Figure 13; unless otherwise specified.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier MGU050 102 handbook, halfpage THD (%) 10 VCC = 12 V 1 18 V 10−1 10−2 10−2 10−1 1 10 Po (W) 102 Fig 6. Total harmonic distortion as function of output power. MGU051 10 handbook, full pagewidth THD (%) 1 VCC = 12 V VCC = 18 V Po = 0.1 W VCC = 12 V VCC = 18 V Po = 1 W 10−1 10−2 10 102 103 104 105 f (Hz) 106 No bandpass filter applied. Fig 7. Total harmonic distortion as function of frequency. © Philips Electronics N.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier MGU056 20 Po (W) handbook, halfpage Ptot (W) 16 8 12 6 RL = 8 Ω 8 RL = 8 Ω 16 Ω 4 4 0 0 MGU057 10 handbook, halfpage 16 Ω 2 4 8 12 16 20 VCC (V) 0 0 5 15 10 20 VCC (V) THD = 10%. Fig 8. Output power as function of supply voltage. MGU059 100 handbook, halfpage Fig 9. Total power dissipation as function of supply voltage.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier MGU054 0 handbook, full pagewidth SVRR (dB) −20 B −40 −60 A −80 10 102 103 104 f (Hz) 105 VCC = 18 V; RS = 0 Ω; Vripple = 707 mV (RMS); no bandpass filter applied. Curve A: inputs short-circuited Curve B: inputs short-circuited and connected to ground (asymmetrical application) Fig 12. Supply voltage ripple rejection as function of frequency. © Philips Electronics N.V. 2000. All rights reserved.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 13. Internal circuitry Table 9: Internal circuitry Pin Symbol 4 and 5 IN+ and IN− Equivalent circuit VCC VCC 1.5 kΩ 1.5 kΩ 45 kΩ 45 kΩ VCC 4 5 1/2 VCC (SVR) 1 and 3 MGU078 OUT− and OUT+ 100 Ω 1, 3 40 Ω 1/2 VCC MGU080 7 MODE VCC VCC 1 kΩ 20 kΩ 1 kΩ VCC 7 MUTE HIGH OFF HIGH MGU079 6 SVR VCC Standby 20 kΩ 6 20 kΩ MGU081 © Philips Electronics N.V. 2000. All rights reserved.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 14. Application information +VCC handbook, full pagewidth 100 nF 220 nF Rs 1000 µF 2 Symmetrical input 30 kΩ Ci IN− 5 Rs 220 nF 1.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 54 mm idth 56 mm ON MUTE + − 10 µF 9 220 nF IN− 1.5 nF 220 nF IN+ 1 VCC OUT− 100 nF 1000 µF GND OUT+ MGU049 Fig 14. Printed-circuit board layout (single-sided); components view. 14.1.2 Power supply decoupling Proper supply bypassing is critical for low-noise performance and high supply voltage ripple rejection. The respective capacitor locations should be as close as possible to the device and grounded to the power ground.
PAGE 15
TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 14.2 Thermal behaviour and heatsink calculation The measured maximum thermal resistance of the IC package, Rth(j-mb) is 9 K/W. A calculation for the heatsink can be made, with the following parameters: Tamb(max) = 50 °C VCC = 18 V and RL = 8 Ω Tj(max) = 150 °C. Rth(tot) is the total thermal resistance between the junction and the ambient including the heatsink. In the heatsink calculations the value of Rth(mb-h) is ignored.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 16. Package outline SIL9P: plastic single in-line power package; 9 leads SOT131-2 non-concave Dh x D Eh view B: mounting base side d A2 seating plane B E j A1 b L c 1 9 e Z Q w M bp 0 5 10 mm scale DIMENSIONS (mm are the original dimensions) UNIT A1 max. A2 b max. bp c D (1) d Dh E (1) e Eh j L Q w x Z (1) mm 2.0 4.6 4.4 1.1 0.75 0.60 0.48 0.38 24.0 23.6 20.0 19.6 10 12.2 11.8 2.54 6 3.4 3.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 17. Soldering 17.1 Introduction to soldering through-hole mount packages This text gives a brief insight to wave, dip and manual soldering. A more in-depth account of soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages (document order number 9398 652 90011). Wave soldering is the preferred method for mounting of through-hole mount IC packages on a printed-circuit board. 17.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 18. Revision history Table 11: Revision history Rev Date CPCN Description 02 20000407 - Product specification; second version; supersedes initial version TDA8945S-01 of 14 April 1999 (9397 750 04878). Modifications: • • • Table 1 on page 1: SVRR: Typ value 65 dB → added Ordering options removed Section 8 “Functional description”: – Section 8.1 “Input configuration” on page 4 → added. – Section 8.2 “Power amplifier” on page 4: ........
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier 19. Data sheet status Datasheet status Product status Definition [1] Objective specification Development This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. Preliminary specification Qualification This data sheet contains preliminary data, and supplementary data will be published at a later date.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier Philips Semiconductors - a worldwide company Argentina: see South America Australia: Tel. +61 2 9704 8141, Fax. +61 2 9704 8139 Austria: Tel. +43 160 101, Fax. +43 160 101 1210 Belarus: Tel. +375 17 220 0733, Fax. +375 17 220 0773 Belgium: see The Netherlands Brazil: see South America Bulgaria: Tel. +359 268 9211, Fax. +359 268 9102 Canada: Tel. +1 800 234 7381 China/Hong Kong: Tel. +852 2 319 7888, Fax.
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TDA8945S Philips Semiconductors 15 W mono BTL audio amplifier Contents 1 2 3 4 5 6 7 7.1 7.2 8 8.1 8.2 8.2.1 8.2.2 8.3 8.3.1 8.4 8.5 8.5.1 8.5.2 9 10 11 12 13 14 14.1 14.1.1 14.1.2 14.2 15 15.1 15.2 16 17 17.1 17.2 17.3 17.4 18 19 20 21 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Quick reference data . . . . . . . . . . . . . . . . . . . .